P2074 Jeep Grand Cherokee - MAP/TPS Correlation - High Airflow/Vacuum Leak Detected

P2074 (MAP/TPS Correlation - High Airflow/Vacuum Leak Detected) on a Jeep Grand Cherokee? This video walks through the complete 17-step factory diagnostic procedure with the wiring diagram and connector views - no guesswork, no parts cannon.

When monitored: During all drive modes.
Set condition: If vacuum drops below 1.5 inches Hg with engine RPM greater than 2000 RPM and closed throttle. One Trip Fault. Three good trips to turn off the MIL.

In this video:
1. Active DTC
2. Vacuum Leak
3. MAP Sensor Operation
4. Tp Sensor Operation
5. Excessive Resistance In The (F855) 5-Volt Supply Circuit
6. (F855) 5-Volt Supply Circuit Shorted To Ground
7. Throttle Position Sensor
8. Excessive Resistance In The (K22) Tp No.1 Signal Circuit
9. (K22) Tp Sensor No.1 Signal Circuit Shorted To Ground
10. Excessive Resistance In The (K900) Sensor Ground Circuit
11. Excessive Resistance In The (F856) 5-Volt Supply Circuit
12. (F856) 5-Volt Supply Circuit Shorted To Ground
13. MAP Sensor
14. Excessive Resistance In The (K1) MAP Signal Circuit
15. (K1) MAP Signal Circuit Shorted To Ground
16. Excessive Resistance In The (K900) Sensor Ground Circuit
17. PCM

Possible causes covered: Vacuum Leak; Resistance In The (F856) 5-Volt Supply Circuit; (F856) 5-Volt Supply Circuit Shorted To Ground; Resistance In The (K1) MAP Signal Circuit; (K1) MAP Signal Circuit Shorted To Ground; Resistance In The (F855) 5-Volt Supply Circuit; (F855) 5-Volt Supply Circuit Shorted To Ground; Resistance In The (K22) Tp Sensor NO.1 Signal Circuit.

Applies to the Jeep Grand Cherokee third generation (WK, 2005-2010) with the 3.7L V6, 4.7L V8 and 5.7L HEMI V8 (and SRT-8 6.1L). Much of the diagnostic logic is shared with the related Jeep Commander (XK) of the same era.

This is general information for educational purposes - always confirm against the service information for your exact vehicle.

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